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HTTP Non-Persistent & Persistent Connection | Set 2 (Practice Question)

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Prerequisite: HTTP Non-Persistent & Persistent Connection – Set 1 For question point of view you need to know that Non-persistent connection is known as HTTP 1.0 and Persistent connection is known as HTTP 1.1.
    • Non-Persistent Connection: It requires connection setup again and again for each object to send.
    • Persistent connection: It does not require connection setup again and again. Multiple objects can use connection.
    Questions : Assume that you have base HTML file with 30 embedded images, images & base file are small enough to fit in one TCP segment. How many RTT are required to retrieve base file & images under-following condition : (i) Non-Persistent connection without parallel connection (ii) Non-persistent connection with 10 parallel connection (iii) Persistent connection without pipe-lining (iv) Persistent connection with pipe-lining (Assume RTT dominates all other time) Explanation : 2RTT is the initial required connection one for TCP connection and one for HTML base file.
    Total time = 2RTT + transmit time
    (i) Non-Persistent connection with no parallel connection : Here for each image 2 RTT are required one for TCP connection and one for image to send. So transmit time for 30 images = 2*(30 RTT) = 60 RTT Total time = 2 RTT+60 RTT = 62RTT (ii) Non-persistent connection with 10 parallel connection : Here 10 images can be send simultaneously. So for 30 images it required -> 2*(30/10) = 6RTT Total time = 2 RTT + 6 RTT = 8RTT (iii) Persistent connection without pipelining : Here TCP connection is required again and again. So for 30 images it requires -> 30 RTTs Total time = 2 RTT + 30 RTT = 32RTT (iv) Persistent connection with pipe-lining : Since it is Persistent connection TCP connection is not required again and again. Pipe-lining means in one packet only images which can fit, can be send. In Pipe-lining connection we can send all images in 1RTT. Total time = 2 RTT + 1 RTT = 3RTT

    Last Updated : 21 Sep, 2017
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